Fares, Tickets & Distribution

The booking record: PNR

When you book a flight, the airline (or a travel agent on its behalf) creates a PNR — a Passenger Name Record. This is the master record of your itinerary: flights, passenger details, and any special requests, all tied together under one reference. Everything from check-in to baggage handling ultimately traces back to this record.

Fare classes and booking codes

Airlines don't sell every seat on a flight at one price. Each cabin (economy, business, etc.) is divided into multiple fare classes (also called booking classes), each represented by a single letter code and tied to a specific price, set of conditions (refundability, change fees, mileage earning) and limited inventory. The full set of conditions attached to a fare — including how far in advance it must be booked, any minimum stay, and cancellation terms — is often called the fare basis. As cheaper fare classes sell out, the airline's system automatically starts selling from the next, higher-priced class, which is part of why the same flight can cost different amounts depending on when you book.

Revenue management: how prices actually move

Behind the scenes, airlines use revenue management systems that continuously adjust how many seats are open in each fare class, based on demand forecasts, how far out the flight is, competitor pricing, and how quickly seats are selling relative to historical patterns for that route and date. This is why fares on some routes can shift, or jump between fare classes, literally within the same day — it isn't random, but the output of an algorithm trying to sell every seat for the highest price the market will bear, while still filling the aircraft by departure.

How tickets get distributed

There are several channels through which a ticket reaches a passenger. Direct booking is through the airline's own website, app, or call center. Online travel agencies (OTAs) and traditional travel agents sell tickets on the airline's behalf, often pulling fares through a Global Distribution System (GDS) — a network that lets travel agents search and book fares across many airlines from one system. More recently, NDC (New Distribution Capability) is an industry data standard that lets airlines distribute richer, more customized offers (like bundled extras) through modern booking channels, beyond what older GDS technology was originally built for.

Interline and codeshare tickets

A single ticket often covers flights operated by more than one airline. An interline agreement lets two airlines honor each other's tickets, check baggage through to a final destination, and rebook passengers onto each other's flights during disruptions, even without any deeper commercial relationship between them. A codeshare goes further: one airline markets and sells tickets, under its own flight number, for a flight that's actually operated by a different airline — common within airline alliances, and the reason the flight number on your ticket doesn't always match the airline whose aircraft you actually board.

What's actually in the price

A displayed ticket price is rarely one single number under the hood. It's typically built from a base fare — the airline's own charge for carriage — plus carrier-imposed surcharges (sometimes covering things like fuel costs) and a list of government taxes and fees, which can include airport departure taxes, passenger security charges, and aviation authority fees that vary by country and even by airport. Two passengers flying the identical route on the identical fare class can occasionally see slightly different total prices if their itineraries route through different countries or airports along the way, simply because the taxes and fees attached to each routing differ. This is also why a refund is rarely a full refund of the ticket price: government taxes tied to a flight that didn't happen are usually returned, but any nonrefundable portion of the fare and the airline's own change or cancellation fees typically are not.

The e-ticket

Almost all tickets today are e-tickets — an electronic record rather than a physical paper document. What you actually hold (a confirmation email, an app screen, a PDF) is just a representation of that electronic record; the ticket itself lives in the airline's system, tied to your PNR.

Beyond the base fare: ancillary revenue

Many airlines — especially low-cost carriers — price the base seat low and generate meaningful revenue from ancillary services: checked baggage, seat selection, extra legroom, priority boarding, onboard food and drink, in-flight wifi, and travel insurance, among others. This unbundling is a deliberate commercial strategy, not an accident, letting airlines advertise a low headline fare while passengers pay separately for what they actually use — and it means two passengers on the identical flight, in the identical fare class, can end up paying quite different total amounts once their individual add-ons are counted. Airlines typically group these choices into named fare bundles — sometimes labeled "basic," "standard," and "flexible" tiers — packaging a fixed set of ancillaries together at one price rather than requiring every add-on to be chosen individually, which makes comparing offers across airlines a little more involved than comparing a single headline number would suggest.